/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup GHOST
 */

/**
 * Copyright (C) 2001 NaN Technologies B.V.
 */

#include "GHOST_DisplayManager.h"
#include "GHOST_Debug.h"

GHOST_DisplayManager::GHOST_DisplayManager(void) : m_settingsInitialized(false)
{
}

GHOST_DisplayManager::~GHOST_DisplayManager(void)
{
}

GHOST_TSuccess GHOST_DisplayManager::initialize(void)
{
  GHOST_TSuccess success;
  if (!m_settingsInitialized) {
    success = initializeSettings();
    m_settingsInitialized = true;
  }
  else {
    success = GHOST_kSuccess;
  }
  return success;
}

GHOST_TSuccess GHOST_DisplayManager::getNumDisplays(GHOST_TUns8 & /*numDisplays*/) const
{
  // Don't know if we have a display...
  return GHOST_kFailure;
}

GHOST_TSuccess GHOST_DisplayManager::getNumDisplaySettings(GHOST_TUns8 display,
                                                           GHOST_TInt32 &numSettings) const
{
  GHOST_TSuccess success;

  GHOST_ASSERT(m_settingsInitialized,
               "GHOST_DisplayManager::getNumDisplaySettings(): m_settingsInitialized=false");
  GHOST_TUns8 numDisplays;
  success = getNumDisplays(numDisplays);
  if (success == GHOST_kSuccess) {
    if (display < numDisplays) {
      numSettings = m_settings[display].size();
    }
    else {
      success = GHOST_kFailure;
    }
  }
  return success;
}

GHOST_TSuccess GHOST_DisplayManager::getDisplaySetting(GHOST_TUns8 display,
                                                       GHOST_TInt32 index,
                                                       GHOST_DisplaySetting &setting) const
{
  GHOST_TSuccess success;

  GHOST_ASSERT(m_settingsInitialized,
               "GHOST_DisplayManager::getNumDisplaySettings(): m_settingsInitialized=false");
  GHOST_TUns8 numDisplays;
  success = getNumDisplays(numDisplays);
  if (success == GHOST_kSuccess) {
    if (display < numDisplays && ((GHOST_TUns8)index < m_settings[display].size())) {
      setting = m_settings[display][index];
    }
    else {
      success = GHOST_kFailure;
    }
  }
  return success;
}

GHOST_TSuccess GHOST_DisplayManager::getCurrentDisplaySetting(
    GHOST_TUns8 /*display*/, GHOST_DisplaySetting & /*setting*/) const
{
  return GHOST_kFailure;
}

GHOST_TSuccess GHOST_DisplayManager::setCurrentDisplaySetting(
    GHOST_TUns8 /*display*/, const GHOST_DisplaySetting & /*setting*/)
{
  return GHOST_kFailure;
}

GHOST_TSuccess GHOST_DisplayManager::findMatch(GHOST_TUns8 display,
                                               const GHOST_DisplaySetting &setting,
                                               GHOST_DisplaySetting &match) const
{
  GHOST_TSuccess success = GHOST_kSuccess;
  GHOST_ASSERT(m_settingsInitialized,
               "GHOST_DisplayManager::findMatch(): m_settingsInitialized=false");

  int criteria[4] = {
      (int)setting.xPixels, (int)setting.yPixels, (int)setting.bpp, (int)setting.frequency};
  int capabilities[4];
  double field, score;
  double best = 1e12;  // A big number
  int found = 0;

  // Look at all the display modes
  for (int i = 0; (i < (int)m_settings[display].size()); i++) {
    // Store the capabilities of the display device
    capabilities[0] = m_settings[display][i].xPixels;
    capabilities[1] = m_settings[display][i].yPixels;
    capabilities[2] = m_settings[display][i].bpp;
    capabilities[3] = m_settings[display][i].frequency;

    // Match against all the fields of the display settings
    score = 0;
    for (int j = 0; j < 4; j++) {
      field = capabilities[j] - criteria[j];
      score += field * field;
    }

    if (score < best) {
      found = i;
      best = score;
    }
  }

  match = m_settings[display][found];

  GHOST_PRINT("GHOST_DisplayManager::findMatch(): settings of match:\n");
  GHOST_PRINT("  setting.xPixels=" << match.xPixels << "\n");
  GHOST_PRINT("  setting.yPixels=" << match.yPixels << "\n");
  GHOST_PRINT("  setting.bpp=" << match.bpp << "\n");
  GHOST_PRINT("  setting.frequency=" << match.frequency << "\n");

  return success;
}

GHOST_TSuccess GHOST_DisplayManager::initializeSettings(void)
{
  GHOST_TUns8 numDisplays;
  GHOST_TSuccess success = getNumDisplays(numDisplays);
  if (success == GHOST_kSuccess) {
    for (GHOST_TUns8 display = 0; (display < numDisplays) && (success == GHOST_kSuccess);
         display++) {
      GHOST_DisplaySettings displaySettings;
      m_settings.push_back(displaySettings);
      GHOST_TInt32 numSettings;
      success = getNumDisplaySettings(display, numSettings);
      if (success == GHOST_kSuccess) {
        GHOST_TInt32 index;
        GHOST_DisplaySetting setting;
        for (index = 0; (index < numSettings) && (success == GHOST_kSuccess); index++) {
          success = getDisplaySetting(display, index, setting);
          m_settings[display].push_back(setting);
        }
      }
      else {
        break;
      }
    }
  }
  return success;
}
